Lansing bonnell



L. BONNELL.

` 4 Hot Air Furnace. 110.110.731. Pamed Jams, 1871.-

N. PETERS. FHOTO-LITHOGRAPHER. WASHINGTON. D C.

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Letters Patent No. 110,731, dated January 3, 1871.v

IMPROVEMENT IN HOT-AIR'FURNACES.

The Schedule referred to in these Letters Patent and making part' ofthe same.

I, LANSING BONNELL, of Milwaukee, in the conn-` ty of Milwaukee, inthe lState of Wisconsin, have invented certain Improvements in Furnaces, of which .the following is a specification.

Nat-ure 'and Object of the Invention.-

My invention is a furnace, `which it is intended shall economize fuel and be effective in its operation, and this I do by tubes E, with flanges on them, set so as to forma tire-chamber, the anges being shorter than the tubes, so that the draught will pass over their tops and down their outsidcs, and in through at the bottom, and pass out through and between guides U U, with a drum in the top ofthe furnace, forming a large heating-surface.

Description of thc Drawing forming part of this Specinaction..

Figure l is a front View of the furnace with a brick setting;

Figure 2 is a vertical sectional view; and

Figure 3 is a cross-sectional view.

General Description. A is the outside shell of the furnace'. It is designed to inclose this furnace in a shell of brick, as `shown in iig, 1, or to make it portable by inclosing it in an iron ease.

B is the bottom plate ofthe furnace.

C, inner drum of a cylinder' over the tire.

D, the outside of the'drum, a'nd between it and the inner drum G is an air-space.

E, the air-tubes, open through the bottom and top of the furnace, with a flange, Y, on each one, which reaches across to the next tube, making a tight fire chamber.

F, the top plate ot' the furnace, 1u the center of which and over the lire, is a' heating air-cylinder, C

-and D.

G, the front-of the furnace. H, cold-air pipe lending to the airthamber in cylinder C and D.-

1, the door through which the fuel is fed to the furnace.

K, ash-pit door.

L, damper in door K.

M, damper in door I.

N, door to the bottom ofthe furnace.

O, large door to the front ofthe furnace, and which shuts outside of all the other doors.

P, damper in door O.

Q, the grate.

lt, a pipe for direct draught from the fire, which is used when starting the fire.

S, the draught-pipe to be used when the lire has been started and is well going.

T, damper in direct-draughtpipe R.

U'U drop-guideson the bottom of the furnace.

V, smoke-passage. n

W W, flanges out from a couple of the air-tubes to the shell of the furnace, making the smoke-passage.

, X, the ash-pit floor.

Y, flanges on the air-tubes, one on each of them,

to till up the space between them, and make the fircpot.

Z, passage for draught under the flanges Y.

Z', passage over these flanges Y for draught.

The-se flanges Y are shorter' than the air-tubes, both at top and bottom, except the two which form the air-passage V, and these are shorter at the bottom oni y.

The operation oi this furnace is that, being put up with a brick or iron casing, the fuel is put iu through door I, and lies on 'grate Q; the damper in the ashpit door is left open, as well as the damper in pipe RL This gives a direct land short passage to the chimney.

When the fire has got well under way, then close the damper T, and the draught and heat will pass up over v the openings Z', and pass down the outside of air-tubes E, and in through openings Z and around the draughtguides U U, and into passage V, and out through pipe S to the chimney, the cold air passing down the outside of an air-chamber, and up through air-tubes E, thus giving a large amount of h.eatingsurface.

Claims.

I claim as my invention- 1. Draught-guides U U, in combination with air-tubes E, with flanges Y and flanges XV W, bottom B, and

ash-pit floor X, substantially as described.

y stantially as described.

5. A furnace, having tubes E, with openings bctween them at their tops and bottoms, so that the draught may pass out .between them at their top and down their outsiders, and in through between them at the bottom, and out again between guides U U, substantially as described.. f

litnesses:

J. BSMLTH, F. S. -BONNELL- LANSING BONNELL. 

